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Why two almost-equal notes make a wobble: beats and the piano tuner's trick
Play two almost-equal notes together and you hear one pitch that swells and fades. Those swells are beats, and their rate is simply the difference in…
Why soap bubbles swirl with colour, then turn black just before they pop
Soap has no dye, yet bubbles shimmer with magenta, gold and green. The colour comes from thickness: light bounces off both the front and the back of the film…